assimp_cmd: prettier and better-compressed node hierarchy.

Also removed line and nesting limits.
It's better to show all the info than to silently discard some.
With the new compressed display, it is far less obtrusive anyway.

tools/assimp_cmd/Info.cpp

@@ -46,12 +46,31 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "Main.h"
 
+#include <cstdio>
+#include <iostream>
+#include <string>
+
 const char* AICMD_MSG_INFO_HELP_E =
 "assimp info <file> [-r] [-v]\n"
 "\tPrint basic structure of a 3D model\n"
 "\t-r,--raw: No postprocessing, do a raw import\n"
 "\t-v,--verbose: Print verbose info such as node transform data\n";
 
+const std::string TREE_BRANCH_ASCII = "|-";
+const std::string TREE_BRANCH_UTF8 = "\xe2\x94\x9c\xe2\x95\xb4";
+const std::string TREE_STOP_ASCII = "'-";
+const std::string TREE_STOP_UTF8 = "\xe2\x94\x94\xe2\x95\xb4";
+const std::string TREE_CONTINUE_ASCII = "| ";
+const std::string TREE_CONTINUE_UTF8 = "\xe2\x94\x82 ";
+
+// note: by default this is outputing utf-8 text.
+// this is well supported on pretty much any linux terminal.
+// if this causes problems on some platform,
+// put an #ifdef to use the ascii version for that platform.
+const std::string TREE_BRANCH = TREE_BRANCH_UTF8;
+const std::string TREE_STOP = TREE_STOP_UTF8;
+const std::string TREE_CONTINUE = TREE_CONTINUE_UTF8;
+
 
 // -----------------------------------------------------------------------------------
 unsigned int CountNodes(const aiNode* root)
@@ -184,46 +203,77 @@ std::string FindPTypes(const aiScene* scene)
 }
 
 // -----------------------------------------------------------------------------------
-void PrintHierarchy(const aiNode* root, unsigned int maxnest, unsigned int maxline,
-					unsigned int cline, bool verbose, unsigned int cnest=0)
-{
-	if (cline++ >= maxline || cnest >= maxnest) {
-		return;
+// Prettily print the node graph to stdout
+void PrintHierarchy(
+	const aiNode* node,
+	const std::string &indent,
+	bool verbose,
+	bool last = false,
+	bool first = true
+){
+	// tree visualization
+	std::string branchchar;
+	if (first) { branchchar = ""; }
+	else if (last) { branchchar = TREE_STOP; } // "'-"
+	else { branchchar = TREE_BRANCH; } // "|-"
+
+	// print the indent and the branch character and the name
+	std::cout << indent << branchchar << node->mName.C_Str();
+
+	// if there are meshes attached, indicate this
+	if (node->mNumMeshes) {
+		std::cout << " (mesh ";
+		bool sep = false;
+		for (size_t i=0; i < node->mNumMeshes; ++i) {
+			unsigned int mesh_index = node->mMeshes[i];
+			if (sep) { std::cout << ", "; }
+			std::cout << mesh_index;
+			sep = true;
+		}
+		std::cout << ")";
 	}
 
-	for(unsigned int i = 0; i < cnest; ++i) {
-		printf("-- ");
-	}
-	printf("\'%s\', meshes: %u\n",root->mName.data,root->mNumMeshes);
+	// finish the line
+	std::cout << std::endl;
 
+	// in verbose mode, print the transform data as well
 	if (verbose) {
-		// print the actual transform
-		//printf(",");
+		// indent to use
+		std::string indentadd;
+		if (last) { indentadd += "  "; }
+		else { indentadd += TREE_CONTINUE; } // "| "..
+		if (node->mNumChildren == 0) { indentadd += "  "; }
+		else { indentadd += TREE_CONTINUE; } // .."| "
 		aiVector3D s, r, t;
-		root->mTransformation.Decompose(s, r, t);
+		node->mTransformation.Decompose(s, r, t);
 		if (s.x != 1.0 || s.y != 1.0 || s.z != 1.0) {
-			for(unsigned int i = 0; i < cnest; ++i) { printf("   "); }
-			printf("      S:[%f %f %f]\n", s.x, s.y, s.z);
+			std::cout << indent << indentadd;
+			printf("  S:[%f %f %f]\n", s.x, s.y, s.z);
 		}
 		if (r.x || r.y || r.z) {
-			for(unsigned int i = 0; i < cnest; ++i) { printf("   "); }
-			printf("      R:[%f %f %f]\n", r.x, r.y, r.z);
+			std::cout << indent << indentadd;
+			printf("  R:[%f %f %f]\n", r.x, r.y, r.z);
 		}
 		if (t.x || t.y || t.z) {
-			for(unsigned int i = 0; i < cnest; ++i) { printf("   "); }
-			printf("      T:[%f %f %f]\n", t.x, t.y, t.z);
+			std::cout << indent << indentadd;
+			printf("  T:[%f %f %f]\n", t.x, t.y, t.z);
 		}
 	}
-	//printf("\n");
 
-	for (unsigned int i = 0; i < root->mNumChildren; ++i ) {
-		PrintHierarchy(root->mChildren[i],maxnest,maxline,cline,verbose,cnest+1);
-		if(i == root->mNumChildren-1) {
-			for(unsigned int i = 0; i < cnest; ++i) {
-				printf("   ");
-			}
-			printf("<--\n");
-		}
+	// and recurse
+	std::string nextIndent;
+	if (first) { nextIndent = indent; }
+	else if (last) { nextIndent = indent + "  "; }
+	else { nextIndent = indent + TREE_CONTINUE; } // "| "
+	for (size_t i = 0; i < node->mNumChildren; ++i) {
+		bool lastone = (i == node->mNumChildren - 1);
+		PrintHierarchy(
+			node->mChildren[i],
+			nextIndent,
+			verbose,
+			lastone,
+			false
+		);
 	}
 }
 
@@ -406,8 +456,7 @@ int Assimp_Info (const char* const* params, unsigned int num)
 
 	// node hierarchy
 	printf("\nNode hierarchy:\n");
-	unsigned int cline=0;
-	PrintHierarchy(scene->mRootNode,20,1000,cline,verbose);
+	PrintHierarchy(scene->mRootNode,"",verbose);
 
 	printf("\n");
 	return 0;